JPS635580Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a longitudinal adjustment device for a headrest provided in an automobile seat.

Generally, the headrest is fixed to the backrest of the seat, but it can be adjusted to move up and down relative to the backrest. However, there are some models in which the headrest can be adjusted in the longitudinal direction in order to match the degree of reclining of the backrest or the body position of the seated occupant. For example, as shown in Japanese Patent Publication No. 56-11446, there is a device that incorporates a link arm to adjust the headrest back and forth, but the present invention uses a rack tooth and a group of gears meshed with it to adjust the headrest back and forth. This is how it was done.

Next, the structure of the longitudinal adjustment device according to the present invention will be explained with reference to embodiments shown in the drawings.

The headrest 1 is formed by filling a hollow headrest frame 2 with a pad 3 and covering the outer periphery with a skin 4. and headrest 1
The two stays 6 that support the seat are inserted into the backrest (not shown) of the seat, and a horizontal member 7 is spanned over the upper ends of the two stays 6, with rack teeth carved into both ends. Each board is fixed in an upright position.

Figures 1 and 2 show the first embodiment,
The respective boards 8, 8 fixed to both ends of the horizontal member 7 are connected to the left and right walls 2 of the headrest frame 2.
a, 2a are provided close to each other along the inner surfaces thereof. Then, the base plate 8 is hollowed out and rack teeth 10 and 11 are cut in two stages, upper and lower, in the front-rear direction.

In addition, the left and right walls 2 of the headrest frame 2
A and 2a support gear groups in which opposing left and right gears are respectively formed in the same shape. This gear group consists of a gear 12 and a gear 13 of the same diameter that meshes with it.
The gear 12 meshes with the upper rack teeth 10, and the gear 13 meshes with the lower rack teeth 11.

The opposing left and right gears 12, 12 are connected by a connecting shaft 15, and one end of the connecting shaft 15 is provided in a bearing 16 on one wall 2a of the headrest frame 2.
The other end of the connecting shaft 15 is supported by a locking device 18 (for preventing arbitrary rotation of the connecting shaft 15) provided on the other wall 2a of the headrest frame 2. The end of the connecting shaft 15 on the side of the locking device 18 is made to protrude outward from the wall 2a, and a pick 20 is fitted to the tip.

Furthermore, the support shafts 21 provided on the left and right gears 13 are supported by bearings 22 provided on the wall portions 2a of the headrest frame 2, respectively.

With this structure, when the camera 20 is rotated with a finger and the gear 12 is rotated in the G direction via the connecting shaft 15 as shown in FIG. Since the connecting shaft 15 is engaged with the connecting shaft 15, the connecting shaft 15 moves in the front direction, that is, in the F direction.
At this time, the gear 13 meshing with the gear 12 is H
Since the gear 13 meshes with the fixed rack teeth 11, the support shaft 21 also moves in the F direction. Since the gear 12 and the gear 13 are formed to have the same diameter and rotate at the same peripheral speed, the connecting shaft 15
and the support shaft 21 move the same distance in the F direction. That is, the entire headrest 1 moves in parallel in the front direction (direction F) with respect to the base plate 8 (that is, the stay 6). If the camera 20 is rotated in the opposite direction, the headrest 1 will move in parallel toward the rear.

3 and 4 show the second embodiment,
FIG. 3 illustrates the right half of the device.
On the left side, as on the right side, a board (rack teeth) and a group of gears are arranged symmetrically.

A substrate 23 fixed to the end of the horizontal member 7 is provided close to the inner surface of the wall 2a of the headrest frame 2. The base plate 23 is provided with rack teeth 24 and 25 in two stages, upper and lower, in the front-rear direction. A group of gears is also supported on the wall of the headrest frame 2. This gear group consists of gears 26, 27, and 28 that mesh and interlock in sequence, and gear 2
6 and 28 are formed to have the same diameter, and the gear 26 meshes with the upper rack teeth 24, and the gear 28 meshes with the lower rack teeth 25.

Then, the gear 26 and a gear (not shown) provided on the left side opposite thereto are connected by a connecting shaft 30, and the end of the connecting shaft 30 is connected to the head rest frame 2.
Supported by a locking device 18 provided on the wall 2a of the
A lens 20 is fitted to the tip of the connecting shaft 30. Furthermore, the support shaft 32 provided on the gear 27 is supported by a bearing 33 provided on the wall 2a, and the support shaft 34 provided on the gear 28 is supported on a bearing 35 provided on the wall 2a. Note that the slider 36 is attached to the lower wall of the head rest frame 2, and the frame 2 is attached to the board 23.
It is designed so that when it slides, it slides smoothly.

With this structure, when the camera 20 is rotated with a finger and the gear 26 is rotated in the J direction via the connecting shaft 30 as shown in FIG. Since the connecting shaft 30 is engaged with the connecting shaft 30, the connecting shaft 30 moves in the front direction, that is, in the F direction.
At this time, the gear 27 meshing with the gear 26 is K
Gear 2 rotating in the direction and meshing with gear 27
8 rotates in the M direction. Since the gear 28 meshes with the fixed rack teeth 25, the support shaft 34 moves in the F direction.

Since the gear 26 and the gear 28 are formed to have the same diameter and rotate at the same circumferential speed, the connecting shaft 30 and the supporting shaft 3
4, it moves the same distance in the F direction. That is, the entire headrest 1 moves parallel to the substrate 23 in the front direction (direction F). If the camera 20 is rotated in the opposite direction, the headrest 1 will move in parallel toward the rear.

Now, as shown in FIG. 5, if protrusions 1a, 1a are formed on the left and right ends facing the front of the headrest 1, the occupant's head will be able to sit comfortably when using this. The protrusions 1a, 1a are formed by protruding the left and right walls 2a, 2a of the headrest frame 2 forward to form protrusions 2b, 2b, which are surrounded by a pad 3 and covered with a skin 4. It's summery. If the above-mentioned longitudinal adjustment device is housed within the protruding portion 2b, this device can be made extremely compact, and the thickness of the headrest in the longitudinal direction can be reduced.

That is, FIG. 6 compares the shapes of the headrest 1 of the present invention and a conventional headrest 40, in which a protruding portion 1a is formed at the end facing the front of the headrest 1, and within this, the headrest 1 of the present invention is formed. If the longitudinal adjustment device 1P is provided, the thickness of the headrest 1 in the longitudinal direction becomes 1Q. On the other hand, if the conventional head rest 40 shown by the chain line is provided with a longitudinal adjustment device 40P shown by the chain line at its end, the thickness of the head rest 40 in the longitudinal direction is 40 mm.
Q, and the thickness of the headrest 1 becomes longer than 1Q.

As mentioned above, since the longitudinal adjustment device of the present invention is formed by combining rack teeth and a gear group, the mechanism is simple and compact, and its operation can be performed reliably and smoothly. Since the end of the headrest protrudes forward and the longitudinal adjustment device of the present invention is housed within it, the thickness of the headrest can be made small, and the occupants seated behind it will not feel pressured. There are advantages.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a first embodiment of the present invention;
2 is a sectional view taken along the line A-A in FIG. 6 is a plan view showing an embodiment of the present invention, with main parts cut away, and FIG. 6 is a plan view comparing the headrest of the present invention with that of a conventional example. 1...Head rest, 1a...Protrusion part, 2...
Head rest frame, 2b... protruding portion, 6...
Stay, 10, 10...Rack teeth, 12, 13...
...Gear, 24, 25...Rack tooth, 26, 27,
28... Gear, F... Front direction.

Claims (1)

[Scope of utility model registration request] A hollow headrest frame is provided inside the headrest, a stay inserted into the backrest is extended into this hollow part, and above the stay, rack teeth are fixedly formed in two stages, upper and lower in the front-rear direction in a symmetrical shape. , supporting gear groups that mesh sequentially on the left and right walls of the headrest frame, gears of the same diameter among the gear groups meshing with the rack teeth, respectively;
A connecting shaft that can be rotated from the outside is spanned between a pair of left and right gears to form a headrest back and forth adjustment mechanism. A headrest longitudinal adjustment device, characterized in that the above-mentioned longitudinal adjustment mechanism is housed in a portion thereof.